Slow CI is not your main problem. Trust me. A guy on the internet

The frustration to finish a bit of work and push it only to wait a long time for that CI run green tick. One way to speed things up in that scenario is to execute your setup once for your whole CI. One thing I have been experiencing is having a Sprint 0 to spike, groom the first project tickets and setup CI.

Source: www.codingnagger.com